This might be a stupid question but i didn't know so i need to ask. at what miles should i change the diff oil and trans oil? my car has 47000 miles and the only thing i've done is oil changes.

 

I see lots of people here change out there differential fluid at around 10 or 15k because they want to get rid of all the metal shaving....transmission fluid I don't know because I changed mine along with the differential at 15k and the tranny fluid was as clean as it came from the new bottle.....but I'm cautious so I'll change out the differential fluid every 10k and tranny every 15k from now on.......

 

My first dif fluid change was at 4200mi. Also my first oil change.

I think it should be anually after that, correct me if I'm wrong.

 

so you guys think every year for the diff and trans?

 

Its a good idea. I'd do both now if I were you. You're past Honda's recomended diff fluid change interval (although most do it 3x as often as Honda recomends which is a good idea on this car), and changing your tranny fluid should make your shifting feel better.

 

what kind of price am i looking at getting the diff and trans fluids changed at a Honda Service Department? Would it be cheaper at a different shop and is it reliable?

 

Honda's recommendation:


Differential
Normal duty -- 30k miles or 2 years
Severe duty -- 15k miles or 1 year

Transmission
Normal/Severe duty -- 120K or 8 years

I do mine at the end of every autocross season, which is 1 year and about 8k miles.

I would say that you are way over due either way for the diff change.

Personally, I do my own. It's easy and inexpensive. If I had to go to a shop, I would deal with an independent shop rather than a dealer and I would supply the fluid to make sure the right stuff is used.